Word for cases of things satisfying a property

Question

I'm not sure if this is the place for this but I don't have anyone nearby and I've been blanking on the word for a while.

If you have a property P, and some families of things that exhibit that property, but you also have a few other cases that exhibit the same property but don't belong to any family, what are these few other cases called? I suppose a term one can use is "sparse" but I had in mind a different word.

The finite simple groups that don’t fit into one of the larger classified families are called “sporadic” — FShrike, Aug 16 '22 at 16:40
There is the medical term "idiopathic": a condition having no cause — user619894, Aug 16 '22 at 16:44

score 2 · Accepted Answer · answered Aug 16 '22 at 16:42

2

Two such words are "exceptional" and "sporadic", used e.g. in the contexts of Lie algebras and groups.

answered Aug 16 '22 at 16:42

Ricardo Buring

6,323

Exceptional! That's the word I was looking for, thank you so much. – Capacitor Aug 16 '22 at 16:46

Word for cases of things satisfying a property

1 Answers1